Enhanced micro-interface reaction system and method for preparing lactide from lactic acid

A reaction system and lactide technology, applied in chemical instruments and methods, chemical/physical/physical-chemical reactors, separation methods, etc., can solve the problem of reducing the yield of lactide products, low separation system efficiency, and many by-products. and other problems, to achieve the effect of reducing reaction temperature and catalyst usage, increasing mass transfer area, and improving product quality

CN112934139AInactive Publication Date: 2021-06-11TOWERSMASTER NANJING
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-06-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an enhanced micro-interface reaction system for preparing lactide from lactic acid. The enhanced micro-interface reaction system comprises a lactic acid raw material tank and an oligomerization rectification reactor, wherein the lactic acid raw material tank is connected with the oligomerization rectification reactor; an external micro-interface unit is arranged in the oligomerization rectification reactor; a second reboiler is arranged at the bottom of the first lactide rectification reactor, and materials discharged from the bottom of the first lactide rectification reactor are gasified by the second reboiler and then are introduced into a first micro-interface generator in the first lactide rectification reactor; a second micro-interface generator is arranged below the first micro-interface generator; the first lactide rectification reactor is connected in parallel with a second lactide rectification reactor; and a hydraulic micro-interface generator is arranged in the second lactide rectification reactor. The reaction system provided by the invention can reduce reaction temperature and improve reaction efficiency.
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Description

technical field

[0001] The invention relates to the field of lactide preparation, in particular to an enhanced micro-interface reaction system and method for preparing lactide from lactic acid. Background technique

[0002] The production, development and utilization of lactide have been paid more and more attention in recent years, mainly because the ring-opening polymerization of lactide is an effective method for preparing high molecular weight polylactic acid. Polylactic acid is a promising biodegradable material. Because the final products of its decomposition in the natural environment are carbon dioxide and water, it is non-toxic and harmless to the environment, and has good biocompatibility and biodegradability. It is an excellent medical polymer material due to its excellent mechanical properties and easy processing and molding. The ring-opening polymerization of lactide is an effective method to prepare high-molecular-weight polylactic acid, and the molecular weig...

Examples

Embodiment

[0061] refer to figure 1 As shown, it is a schematic structural diagram of an enhanced micro-interface reaction system for preparing lactide from lactic acid provided in an embodiment of the present invention, which mainly includes a lactic acid raw material tank 10, an oligomerization rectification reactor 20, a reactive rectifier 40, a first propane Lactide rectification reactor 30 , second lactide rectification reactor 301 , first rectification tower 50 , second rectification tower 60 and lactide storage tank 70 . The lactic acid solution in the lactic acid raw material tank 10 enters the oligomerization rectification reactor 20 for oligomerization. Wherein the mass composition of the lactic acid solution is: 88-92% lactic acid, and the rest is composed of water.

[0062] The upper half of the oligomerization rectification reactor 20 is the rectification section of the oligomerization rectification reactor 20 , and the lower half of the oligomerization rectification reacto...